Question

更新

问题是我无法在EditText上显示用户电子邮件

我试图将onStart和onStop mauth监听器放入，然后当我运行应用程序并输入此活动时，用户看到为null并将我踢回登录活动。这有什么解决方案吗？

public class ProfileActivity extends AppCompatActivity {

    private EditText newEmail;
    private FirebaseAuth.AuthStateListener mauthListener;
    private FirebaseAuth mauth;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profile);

        //get current user
        final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

        //get firebase auth instance
        mauth = FirebaseAuth.getInstance();

        newEmail = (EditText) findViewById(R.id.email1);

        //tracking the sign in and singn out operations
        mauthListener = new FirebaseAuth.AuthStateListener(){
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user == null) {
                    // user auth state is changed - user is null
                    // launch login activity
                    startActivity(new Intent(ProfileActivity.this, LoginActivity.class));
                    finish();
                }
            }
        };

        setDataToView();
    }

private void setDataToView() {
final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null){
    newEmail.setText("" + user.getEmail());

} }

已更新 我不能在EditText上显示用户电子邮件，现在有什么不对吗？

Answer 1

因此， setDataToView（）中的firebase用户为null，因为您将usermail设置为Edittext而不检查是否为null以修复您有两种可能的方法。

一个是这样做的：

mauthListener = new FirebaseAuth.AuthStateListener(){
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user == null) {
                    // user auth state is changed - user is null
                    // launch login activity
                    startActivity(new Intent(ProfileActivity.this, LoginActivity.class));
                    finish();
                }else{
                   newEmail.setHint("" + user.getEmail());
                }
            }
        };

其他方式就是这样做：

private void setDataToView() {
    final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
    if (user != null){
        newEmail.setHint("" + user.getEmail());
   }
}

试图用setDataToView显示电子邮件，但用户电子邮件没有在EditText上显示，为什么？

1 个答案: